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Type 347 Stainless SteelType 347 Stainless Steel

Austenitic Stainless Steel with added Columbium

Type 347 stainless is an austenitic steel alloy with added Niobium/Columbium which acts as a stabiliser.

This makes the alloy suitable for service in aqueous and low temperature environments as the alloy has good resistance to intergranular attack. The alloy also offers good resistance to polythionic acid stress corrosion cracking and is therefore a useful a material for use around reactor plants. Type 347 is essentially non-magnetic in the annealed condition and can only be hardened by cold working. The alloy is used in the oil, gas and chemical sector as well as the nuclear industry.

Key Features:

Type 347 stainless steel is classed as a multi-purpose austenitic stainless steel - the alloy offers excellent heat and corrosion resistance. The material has better mechanical properties than 304, which makes the alloy more suitable for high temperature service.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.



Download Type 347 Stainless Steel Datasheet

Typical Applications:

  • Oil refineries
  • Fired heater tubes
  • Thermowells
  • Fluid catalytic cracking units (FCC)
  • Hanger rods
  • Reactor components


We offer Type 347 Stainless Steel in round bar, plate, sheet, wire and tube. We provide processing services at our Head office and 14 service centres across the Group. With more than 30 band saws and a fully automated magazine feed CNC rod blanking line, we can process your material to your specific requirements.

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To find out more about Smiths Metal Centres extensive range of high quality stainless steel products, click on one of our products on the side menu of this web page.

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on 0845 527 3331 or click here to contact us.